Communication method and device

ABSTRACT

Embodiments of this application relate to the field of communications technologies and disclose a communication method and a device. The method includes: determining an offset based on a first quantity, wherein the first quantity is a quantity of beams that are used to determine signal quality of a first cell; and determining the signal quality of the first cell based on the offset.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of U.S. patent application Ser. No.16/568,845, filed on Sep. 12, 2019, which is a continuation ofInternational Application No. PCT/CN2018/080382, filed on Mar. 24, 2018.The International Application claims priority to Chinese PatentApplication No. 201710184879.3, filed on Mar. 24, 2017. All of theafore-mentioned patent applications are hereby incorporated by referencein their entireties.

TECHNICAL FIELD

This application relates to the field of communications technologies,and in particular, to a communication method and a device.

BACKGROUND

As mobile communications technologies develop towards aspects such ashigh speeds and large data service amounts, spectrum demand duringcommunication transmission is increasing. A spectrum in a high frequencyband, including a centimeter wave and a millimeter wave, has a largeamount of available bandwidth, and therefore becomes an importantresource to meet requirements on a large capacity and high bandwidth infuture communications.

The significant development of the mobile communications technologies isaccompanied with increasing user requirements. When a user requires alarger capacity, sending and receiving of data with higher quality and amultiple-antenna technology have attracted more attention, and thereforebeamforming emerges.

Currently, a solution is urgently needed to meet a requirement forreporting a measurement report in a timely manner when a coverage areaof a beam is small and a terminal is moving.

SUMMARY

Embodiments of this application provide a communication method and arelated device. A terminal may report information about a beam thatmeets a condition to a base station in a timely manner, so that theterminal can be handed over, in a timely manner, to the beam that meetsthe condition, avoiding service interruption of the terminal.

According to a first aspect, this application provides a communicationmethod, where the method includes the following. A terminal determinesthat information about a first beam group, which meets a condition forreporting a measurement report, in a first cell is different frominformation about beams in the first cell that is included in a previousmeasurement report.

The terminal sends a first measurement report to a network device, wherethe first measurement report includes identification information ofbeams in the first beam group and signal quality of the beams in thefirst beam group, or the first measurement report includes a quantity ofbeams in the first beam group, or the first measurement report includesidentification information of beams in the first beam group.

In a possible design, that a terminal determines that information abouta first beam group, which meets a condition for reporting a measurementreport, in a first cell is different from information about beams in thefirst cell that is included in a previous measurement report may meanthat: the terminal determines that the identification information of thebeams in the first beam group, which meets the condition for reporting ameasurement report, in the first cell is different from identificationinformation of the beams in the first cell that is included in theprevious measurement report; and/or the terminal determines that thequantity of the beams in the first beam group, which meets the conditionfor reporting a measurement report, in the first cell is different froma quantity of beams in the first cell that is included in the previousmeasurement report.

The identification information of the beam includes at least one of:beam identifier, antenna port identifier of beam, a reference signal ofa beam, and beam index.

The condition for reporting a measurement report includes a reportingparameter related to a quantity of beams that are used to determinesignal quality of the first cell, where the reporting parameter includesat least one of a signal quality threshold, hysteresis, time to trigger,and an offset for reporting.

By implementing this embodiment of this application, when the terminalobtains through measurement that information about a beam that meets thecondition for reporting a measurement report is different frominformation about a beam in the previous measurement report, theterminal may report the measured information about the beam to thenetwork device, so that the terminal is handed over, in a timely manner,to the beam that meets the condition, avoiding service interruption ofthe terminal.

In a possible design, the first measurement report sent by the terminalmay further include the signal quality of the first cell to which thefirst beam group belongs. Specifically, a manner of determining thesignal quality of the first cell may include: the terminal determinesthe signal quality of the first cell based on signal quality of amaximum of M beams having highest signal quality in the first cell; orthe terminal determines the signal quality of the first cell based onsignal quality of a beam whose signal quality is higher than a firstpreset threshold in the first cell.

When signal quality of each beam in the first cell is below the firstpreset threshold, in a current technology, the terminal sets the signalquality of the first cell to a smallest value. However, the signalquality of the first cell cannot be truly reflected in this manner,resulting in a relatively large error when the network device comparessignal quality of cells. Consequently, the network device performsinaccurate mobility control, causing service interruption of theterminal.

In a possible design, when the signal quality of each beam in the firstcell is below the first preset threshold, in an optional implementation,the terminal may determine the signal quality of the first cell based onsignal quality of X beams whose signal quality has a smallest differencefrom the first preset threshold, so as to accurately reflect the signalquality of the first cell, assist the network device in performingaccurate mobility control, and avoid service interruption of theterminal. X may be configured by the network device or may bepredefined, and a value of X is an integer greater than 0.

Alternatively, when the signal quality of each beam in the first cell isbelow the first preset threshold, in another optional implementation,the terminal may determine the signal quality of the first cell based onsignal quality of Y beams that have a difference less than a secondpreset threshold from signal quality of a target beam, where the targetbeam is a beam whose signal quality has a smallest difference from thefirst preset threshold.

In a possible design, the terminal may determine the signal quality ofthe first cell based on an offset, where the offset is determined basedon a first quantity.

In a possible design, the terminal receives first indication informationsent by the network device; and the terminal sends the first measurementreport, where the first measurement report includes the identificationinformation and the signal quality of the beams in the first beam group,or the first measurement report includes the quantity of the beams inthe first beam group, or the first measurement report includes theidentification information of the beams in the first beam group.

In this embodiment of this application, the terminal reports measurementinformation of beam(s) based on a network configuration, so that thenetwork device may make a handover decision more accurately.

According to a second aspect, this application provides anothercommunication method, including: obtaining signal quality of each beamin a first cell; and when the signal quality of each beam in the firstcell is below a first preset threshold, determining signal quality ofthe first cell based on signal quality of X beams whose signal qualityhas a smallest difference from the first preset threshold, where the Xbeams belong to the first cell, and X is an integer greater than 0, ordetermining signal quality of the first cell based on signal quality ofY beams that have a difference less than a second preset threshold fromsignal quality of a target beam, where the target beam belongs to thefirst cell and is a beam whose signal quality has a smallest differencefrom the first preset threshold, the Y beams belong to the first cell,and Y is an integer greater than 0.

In this application, a terminal may determine the signal quality of thefirst cell based on the signal quality of the X beams whose signalquality has the smallest difference from the first preset threshold, soas to accurately reflect the signal quality of the first cell, assist anetwork device in performing accurate mobility control, and avoidservice interruption of the terminal.

According to a third aspect, this application provides anothercommunication method, including: receiving, by a network device, a firstmeasurement report sent by a terminal, where the first measurementreport is sent by the terminal when the terminal determines thatinformation about a first beam group, which meets a condition forreporting a measurement report, in a first cell is different frominformation about beams in the first cell that is included in a previousmeasurement report. The first measurement report includes identificationinformation of beams in the first beam group and signal quality of thebeams in the first beam group, or the first measurement report includesa quantity of beams in the first beam group, or the first measurementreport includes identification information of beams in the first beamgroup.

In another possible design, the network device receives initial signalquality of the first cell and a first quantity of beams that are used todetermine signal quality of the first cell.

The network device determines the signal quality of the first cell withreference to the initial signal quality of the first cell and an offset,where the offset is determined based on the first quantity.

In another possible design, the network device sends first indicationinformation to the terminal, where the first indication information isused to indicate that the first measurement report to be reported by theterminal includes the identification information and the signal qualityof the beams in the first beam group, or the first indicationinformation is used to indicate that the first measurement reportincludes the quantity of the beams in the first beam group, or the firstindication information is used to indicate that the first measurementreport includes the identification information of the beams in the firstbeam group.

In another possible design, the network device sends second indicationinformation to the terminal, where the second indication information isused to indicate a maximum quantity of pieces of identificationinformation that is included in the first measurement report to bereported by the terminal and/or a maximum quantity of signal qualityvalues of beams that is included in the first measurement report.

According to a fourth aspect, this application provides a terminal, andthe terminal includes a module or a unit configured to perform thecommunication method according to the first aspect or the second aspect.

According to a fifth aspect, this application provides another terminal,and the terminal includes a processor, a communications module, and amemory. The memory is configured to store instruction(s). The processoris configured to read the instruction(s) in the memory to perform thecommunication method according to the first aspect or the second aspect.

According to a sixth aspect, this application provides a network device,and the network device includes a module or a unit configured to performthe communication method according to the third aspect.

According to a seventh aspect, this application provides another networkdevice, and the network device includes a processor, a communicationsmodule, and a memory. The memory is configured to store instruction(s).The processor is configured to read the instruction(s) in the memory toperform the communication method according to the third aspect.

According to an eighth aspect, this application provides acommunications system, including a terminal and a network device, wherethe terminal is the terminal described in the fourth aspect or the fifthaspect, and the network device is the network device described in thethird aspect.

According to a ninth aspect, this application provides a computerstorage medium, configured to store computer software instruction(s)used by the foregoing terminal, and the computer software instruction(s)includes a program designed to perform the foregoing aspects.

According to a tenth aspect, this application provides another computerstorage medium, configured to store a computer software instruction(s)used by the foregoing terminal, and the computer software instruction(s)includes a program designed to perform the foregoing aspects.

Beneficial effects of implementing the embodiments of this applicationare as follows.

When the terminal obtains through measurement that information about abeam that meets a condition is different from information about a beamin a previous measurement report, the terminal may report the measuredinformation about the beam to the network device, so as to assist thenetwork device in configuring the beam for the terminal and avoidservice interruption of the terminal.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic architectural diagram of a communications systemaccording to an embodiment of this application;

FIG. 2 is a schematic flowchart of a communication method according toan embodiment of this application;

FIG. 3 is a schematic architectural diagram of another communicationssystem according to an embodiment of this application;

FIG. 4 is a schematic flowchart of another communication methodaccording to an embodiment of this application;

FIG. 5 is a schematic flowchart of another communication methodaccording to an embodiment of this application;

FIG. 6 is a schematic flowchart of another communication methodaccording to an embodiment of this application;

FIG. 7 is a schematic structural diagram of a terminal according to anembodiment of this application;

FIG. 8 is a schematic structural diagram of another terminal accordingto an embodiment of this application;

FIG. 9 is a schematic structural diagram of another terminal accordingto an embodiment of this application;

FIG. 10 is a schematic structural diagram of another terminal accordingto an embodiment of this application;

FIG. 11 is a schematic structural diagram of a network device accordingto an embodiment of this application;

FIG. 12 is a schematic structural diagram of another terminal accordingto an embodiment of this application; and

FIG. 13 is a schematic structural diagram of another network deviceaccording to an embodiment of this application.

DETAILED DESCRIPTION OF ILLUSTRATIVE EMBODIMENTS

Referring to FIG. 1, FIG. 1 is a schematic architectural diagram of acommunications system in an embodiment of this application. Thecommunications system too includes a network device 101 and a terminal102.

The network device 101 may be a network device using a new radio (NR)technology, may be a NodeB (NB) in a 3G (for example, universal mobiletelecommunications system (UMTS), Wideband Code Division Multiple Access(WCDMA), and Time Division-Synchronous Code Division Multiple Access(TD-SCDMA) system, or may be an evolved NodeB (eNB) in a Long TermEvolution (LTE) system. In addition, in this embodiment of thisapplication, the network device 101 may further control a gain value fora direction (or a channel) of each transmit antenna that is configuredas an array antenna to form a plurality of beams. The network device 101communicates with the terminal 102 by using a beam. Moreover, thenetwork device 101 may have other names in an NR system, which includebut are not limited to: base station (BS), evolved base station, and thelike.

The terminal 102 may be referred to as a mobile station, an accessterminal, a subscriber unit, a subscriber station, a remote station, aremote terminal, a mobile device, a user terminal, a terminal, awireless communications device, a user agent, a user apparatus, or otheruser equipment. The terminal 102 may further be a cellular phone, apersonal digital assistant (PDA), a handheld device having a wirelesscommunications function, an in-vehicle device, a wearable device, amobile station in a future 5G network, a terminal device in a futureevolved public land mobile network (PLMN) network, or the like. In thisembodiment of this application, the terminal 102 may measure a signalthat is sent by the network device 101 by using a beam and report ameasurement result to the network device 101 to assist the networkdevice 101 in making a handover decision.

In an application scenario of this application, the network device 101sends a reference signal and/or a synchronization signal (SS) to theterminal 102 based on a beam. The reference signal may be a channelstate information-reference signal (CSI-RS) or the like. The terminal102 measures a reference signal and/or a synchronization signal for aserving cell, an intra-frequency neighboring cell, an inter-frequencyneighboring cell, or an inter-RAT neighboring cell, and reports ameasurement result to the network device 101, so that the network device101 configures a beam or a cell that has highest signal quality for theterminal 102.

Embodiment 1

Referring to FIG. 2, this embodiment of this application provides aschematic flowchart of a communication method. The method includes butis not limited to the following steps.

S201: A terminal determines that information about a first beam group,which meets a condition for reporting a measurement report, in a firstcell is different from information about beams in the first cell that isincluded in a previous measurement report.

It may be understood that the measurement report may include informationabout a plurality of beam groups, and each beam group corresponds to acell. The first beam group herein belongs to a cell, for example, thefirst cell. Then the terminal compares the information about the firstbeam group in the first cell with the information about the beams in thefirst cell that is in the previous measurement report.

In this embodiment of this application, the first beam group may includeat least one beam. The information about the first beam group mayinclude identification information of beams in the first beam groupand/or a quantity of beams in the first beam group.

Step S201 may be as follows: the terminal determines that theidentification information of the beams in the first beam group, whichmeets the condition for reporting a measurement report, in the firstcell is different from identification information of the beams in thefirst cell that is included in the previous measurement report; or theterminal determines that the quantity of the beams in the first beamgroup, which meets the condition for reporting a measurement report, inthe first cell is different from a quantity of beams in the first cellthat is included in the previous measurement report; or the terminaldetermines that the identification information of the beams in the firstbeam group, which meets the condition for reporting a measurementreport, in the first cell is different from identification informationof beams in the first cell that is included in the previous measurementreport, and the quantity of the beams in the first beam group isdifferent from a quantity of beams in the first cell that is included inthe previous measurement report. “Different” herein includes “notidentical” or “completely different.”

For example, that the identification information of the beams in thefirst beam group is different from the identification information of thebeams that is included in the previous measurement report means that theidentification information of the beams in the first beam group is notidentical with the identification information of the beams that isincluded in the previous measurement report. For example, it is assumedthat the identification information of the beams that is included in theprevious measurement report is beam1-1, beam1-2, and beam1-3, and theterminal determines that the identification information of the beams inthe first beam group that meets the condition for reporting ameasurement report is beam1-1, beam1-2, and beam1-4. Identificationinformation beam1-4 of a beam in the first beam group has no samecorresponding identification information in the previous measurementreport. In this case, the terminal determines that the identificationinformation of the beams in the first beam group that meets thecondition for reporting a measurement report is different from theidentification information of the beams that is included in the previousmeasurement report. Alternatively, the identification information of thebeams that is included in the previous measurement report is beam1-1,beam1-2, and beam1-3, and the terminal determines that theidentification information of the beams in the first beam group thatmeets the condition for reporting a measurement report is beam1-1 andbeam1-2. The identification information beam1-3 of a beam in theprevious measurement report has no same corresponding identificationinformation in the identification information of the beams in the firstbeam group. In this case, the terminal determines that theidentification information of the beams in the first beam group thatmeets the condition for reporting a measurement report is different fromthe identification information of the beams that is included in theprevious measurement report. Alternatively, the identificationinformation of the beams that is included in the previous measurementreport is beam1-1, beam1-2, and beam1-3, and the terminal determinesthat the identification information of the beams in the first beam groupthat meets the condition for reporting a measurement report is beam1-4,beam1-5, and beam1-6. None of the identification information of thebeams in the first beam group has same corresponding identificationinformation in the previous measurement report. In this case, theterminal determines that the identification information of the beams inthe first beam group that meets the condition for reporting ameasurement report is different from the identification information ofthe beams that is included in the previous measurement report.

Identification information of a beam may include a beam identifier, anantenna port identifier of the beam, a reference signal of the beam, anindex of the beam, or the like, and is used to uniquely identify thebeam. In this embodiment of this application, a beam may be indicated bya plurality of combinations of letters, digits, or symbols, for example,beam1-1, beam1-2, or beam1-3.

Referring to FIG. 3, FIG. 3 is a schematic architectural diagram ofanother communications system according to this embodiment of thisapplication. As shown in FIG. 3, the measurement report to be reportedby the terminal at a moment T1 includes information about a total ofthree beams: beam1-1, beam1-2, and beam1-3. As the terminal is moving,the terminal obtains through measurement at a moment T2 that the beamsthat meet the condition for reporting a measurement report are a totalof three beams: beam1-4, beam1-5, and beam1-6. The terminal maydetermine that the identification information of the beams that aremeasured at the moment T2 and meet the condition for reporting ameasurement report is different from the identification information ofthe beams that is included in the measurement report at the moment T1.It should be noted that the beams beam1-1, beam1-2, beam1-3, beam1-4,beam1-5, and beam1-6 belong to a same cell, and two base stations inFIG. 3 are a same base station and are merely location examples atdifferent moments.

It may be understood that the condition for reporting a measurementreport herein may be configured by a network device. The condition forreporting a measurement report may include a quality threshold,hysteresis, and the like, for example, signal quality of a beam ishigher than the quality threshold.

S202: The terminal sends a first measurement report to a network device,where the first measurement report includes identification informationof beams in the first beam group and signal quality of the beams in thefirst beam group, or the first measurement report includes a quantity ofbeams in the first beam group, or the first measurement report includesidentification information of beams in the first beam group.

By implementing this embodiment of this application, when the terminalobtains through measurement that information about a beam that meets thecondition for reporting a measurement report is different frominformation about a beam in the previous measurement report, theterminal may report the measured information about the beam to thenetwork device, so that the terminal is handed over, in a timely manner,to the beam that meets the condition, avoiding service interruption ofthe terminal. With reference to FIG. 3, when the terminal obtainsthrough measurement that information about the beams that meet thecondition at the T2 moment is different from information about the beamsthat is included in the measurement report at the moment T1, theterminal may send the information about the beams beam1-4, beam1-5, andbeam1-6 measured at the moment T2 to the network device to assist thenetwork device in making a handover decision, thereby preventing thenetwork device from selecting a beam still from beams in the beaminformation beam1-1, beam1-2, and beam1-3 reported at the moment T1 andconfiguring the beam for the terminal, and avoiding service interruptionof the terminal.

It may be understood that the first measurement report sent by theterminal may further include signal quality of the first cell to whichthe first beam group belongs. For a specific manner of determining thesignal quality of the first cell, refer to descriptions in the followingEmbodiment 2.

It should be noted that if the first measurement report includes onlyidentifiers or the quantity of the beams in the first beam group, thehandover decision may be made further with reference to the previouslyreported signal quality of the first cell or the currently reportedsignal quality of the first cell. A specific handover decision may bemade with reference to related descriptions in the following embodimentsor in another manner. This is not limited in this embodiment of thisapplication.

Embodiment 2

This embodiment provides a method for determining signal quality of acell. The method is applicable to any scenario in which signal qualityof a cell needs to be determined.

Optionally, the method in Embodiment 2 may be independent of otherembodiments or may be combined with Embodiment 1, Embodiment 3, orEmbodiment 4.

As shown in FIG. 4, the method for determining signal quality of a cellmay include the following steps.

S401: A terminal obtains signal quality of each beam in a first cell.

S402 a: Determine signal quality of the first cell based on signalquality of a maximum of M beams having highest signal quality in thefirst cell.

M is a positive integer greater than or equal to 1, and M may beconfigured or predefined.

Optionally, the terminal may calculate an average value of signalquality of a maximum of the first M beams having a highest signalquality, and use the calculated average value as the signal quality ofthe cell.

For example, signal quality of beams beam1-4, beam1-5, and beam1-6 in acell is respectively 2 dB, 12 dB, and 9 dB, and M is equal to 2. In thiscase, the terminal calculates an average value of signal quality of thefirst two beams beam1-5 and beam1-6 having highest signal quality as(12+9)/2=10.5 dB, and uses the average value 10.5 dB as the signalquality of the cell.

Optionally, the terminal may alternatively determine the signal qualityof the first cell in the following manners.

S402 b: Determine signal quality of the first cell based on signalquality of a beam whose signal quality is higher than a first presetthreshold in the first cell. Optionally, the terminal may use an averagevalue of signal quality of beams whose signal quality is higher than thefirst preset threshold as the signal quality of the cell. It may beunderstood that the first preset threshold herein may be configured by anetwork device or may be predefined. This is not limited in thisembodiment of this application.

For example, signal quality of beams beam1-4, beam1-5, and beam1-6 inthe first cell is respectively 2 dB, 12 dB, and 9 dB, and the firstpreset threshold is 5 dB. In this case, the terminal calculates anaverage value of the signal quality of the beams beam1-5 and beam1-6whose signal quality is higher than the first preset threshold 5 dB as(12+9)/2=10.5 dB, and uses the average value 10.5 dB as the signalquality of the first cell.

When the signal quality of each beam in the first cell is below thefirst preset threshold, in a current technology, the terminal sets thesignal quality of the first cell to a smallest value. However, thesignal quality of the first cell cannot be truly reflected in thismanner, resulting in a relatively large error when the network devicecompares signal quality of cells. Consequently, the network deviceperforms inaccurate mobility control, causing service interruption ofthe terminal.

S402C: When the signal quality of each beam in the first cell is below afirst preset threshold, the terminal may determine signal quality of thefirst cell based on signal quality of X beams whose signal quality has asmallest difference from the first preset threshold, so as to accuratelyreflect the signal quality of the first cell, assist a network device inperforming accurate mobility control, and avoid service interruption ofthe terminal. X may be configured by the network device or may bepredefined, and a value of X is an integer greater than 0.

For example, signal quality of beams beam1-4, beam1-5, and beam1-6 inthe first cell is respectively 2 dB, 12 dB, and 9 dB, the first presetthreshold is 15 dB, and the signal quality of each beam in the firstcell is below 15 dB. When X is equal to 1, the terminal may use thesignal quality 12 dB of the beam that has a smallest difference from thefirst preset threshold 15 dB as the signal quality of the first cell.

S402 d: When the signal quality of each beam in the first cell is belowa first preset threshold, the terminal may determine signal quality ofthe first cell based on signal quality of Y beams that have a differenceless than a second preset threshold from signal quality of a targetbeam, where the target beam is a beam whose signal quality has asmallest difference from the first preset threshold. Y may be configuredby a network device or may be predefined, and a value of Y is an integergreater than 0. The target beam may be determined based on a particularcondition. For example, a beam having highest signal quality is used asthe target beam.

For example, signal quality of beams beam1-4, beam1-5, and beam1-6 inthe first cell is respectively 2 dB, 12 dB, and 9 dB, the first presetthreshold is 15 dB, and the second preset threshold is 4 dB. It may belearned that the signal quality of each beam in the first cell is below15 dB. The beam beam1-5 having highest signal quality in the first cellmay be set as the target beam. In this case, the terminal may determinethe signal quality of the cell based on the signal quality 12 dB and 9dB of the beams that have a difference less than the second presetthreshold 4 dB from signal quality of the target beam beam1-5.

Optionally, the terminal may obtain an average value of the signalquality of the beams that have a difference less than the second presetthreshold from the signal quality of the target beam, and use theaverage value as the signal quality of the cell.

The foregoing example is still used. The terminal determines that thesignal quality of the beams that have a difference less than the secondpreset threshold 4 dB from the signal quality of the target beam beam1-5is 12 dB and 9 dB. In this case, the terminal may obtain an averagevalue of the signal quality 12 dB and 9 dB, that is, (12+9)/2=10.5 dB,and use the average value 10.5 dB as the signal quality of the cell.

In this embodiment of this application, the signal quality of the cellis accurately reflected as much as possible by using a rollbackmechanism, to prevent the network device from making an inaccuratemobility judgment.

S403: The terminal sends the determined signal quality of the first cellto a network device.

Embodiment 3

Still another embodiment of this application provides a communicationmethod to improve robustness of a handover decision. The method isapplicable to any scenario in which a handover decision is required.

Optionally, the method in Embodiment 3 may be independent of otherembodiments or may be combined with Embodiment 1, Embodiment 2, orEmbodiment 4.

As shown in FIG. 5, the communications method may include the followingsteps.

S501: A terminal obtains a first quantity of beams that are used todetermine signal quality of a first cell.

S502: The terminal determines the signal quality of the first cell basedon an offset, where the offset is determined based on the firstquantity.

A particular correspondence exists between the first quantity and theoffset. The correspondence may be configured by a network device for theterminal, negotiated between the network device and the terminal, orpredefined in a communications protocol.

Optionally, the correspondence may be explicit or implicit.

Specifically, an explicit relationship means that a directcorrespondence exists between the offset and the first quantity. Forexample, when the first quantity is less than 5, the offset is 1; whenthe first quantity is greater than or equal to 5, the offset is 2.

An implicit relationship means that a coefficient of basic measurementoffset delta is determined based on the first quantity to further obtainthe offset. The basic measurement offset delta may be configured by thenetwork device for the terminal, negotiated between the network deviceand the terminal, or predefined in a communications protocol.

Optionally, the coefficient of delta may be the first quantity. Forexample, the basic measurement offset delta is configured by the networkdevice, and the first quantity is 4. In this case, the coefficient ofdelta is 4, and the offset is 4×delta.

After the offset is obtained in the foregoing manner, the signal qualityof the first cell directly obtained based on a beam may be adjusted.

For example, the signal quality of the first cell directly obtainedbased on a beam is 10.5 dB, the first quantity is 2, and the offsetcorresponding to the first quantity less than 5 is 2. In this case, theterminal determines that final signal quality of the cell is Q=10.5+2.Alternatively, the first quantity is 4, the basic measurement offsetdelta is 0.6, and the offset is 4×0.6. In this case, the terminaldetermines that final signal quality of the cell is (3=10.5+2.4.

S503: The terminal reports the signal quality of the first cell to anetwork device.

It should be noted that in this embodiment of this application, theterminal sends the finally determined signal quality of the cell to thenetwork device. Optionally, adjustment on the signal quality of the cellmay alternatively be implemented by the network device.

For example, S502 may not be performed, but when reporting the signalquality of the first cell to the network device in S503, the terminalmay further report the first quantity to the network device, so that thenetwork device may adjust the reported signal quality of the first cellaccording to a method similar to the method described in S502.

Optionally, some other parameters may also be adjusted at the terminalor the network device according to a method similar to the methoddescribed in S502 and S503. The foregoing parameters may include atleast one of a signal quality threshold, hysteresis, time to trigger,and an offset for reporting. It may be understood that differentparameters may have different basic offsets or different correspondencesbetween the offset and the first quantity. Examples are not given one byone in this embodiment of this application.

In this embodiment of this application, robustness of a handoverdecision may be improved by adjusting the foregoing parameters withreference to the first quantity.

In each embodiment described above, the terminal may report signalquality of a beam and/or signal quality of a cell to the network deviceby using a measurement report.

Embodiment 4

This embodiment of this application provides a communication method.Optionally, the method in Embodiment 4 may be independent of otherembodiments or may be combined with Embodiment 1, Embodiment 2, andEmbodiment 3.

As shown in FIG. 6, the method may include the following steps.

S601: A terminal receives first indication information sent by a networkdevice.

The first indication information may be used to indicate that ameasurement report to be reported by the terminal needs to carrymeasurement information of beam(s).

Optionally, the first indication information may be sent together withanother reporting condition parameter or sent separately. The terminalmay combine the first indication information with other reportingcondition parameter(s) for use.

The measurement information of beam(s) includes but is not limited to:identification information of beam(s) and signal quality of the beam(s),or a quantity of beam(s), or identification information of beam(s).

For example, there are four beams that meet a condition for reporting ameasurement report, identification information of the four beams isbeam1-4, beam1-5, beam1-6, and beam1-7, and signal quality of the fourbeams is 2 dB, 12 dB, 9 dB, and 10 dB. The first indication informationindicates that the measurement report needs to carry the identificationinformation of the beams and the signal quality of the beams. In thiscase, the terminal sends the four pieces of identification informationbeam1-4, beam1-5, beam1-6, and beam1-7 and corresponding four signalquality values 2 dB, 12 dB, 9 dB, and 10 dB through the measurementreport to the network device. Alternatively, the first indicationinformation indicates that the measurement report needs to carry thequantity of the beams. In this case, the terminal sends the quantity 4of beams that meet the condition for reporting a measurement reportthrough the measurement report to the network device. Alternatively, thefirst indication information indicates that the measurement report needsto carry the identification information of the beams. In this case, theterminal sends the four pieces of identification information beam1-4,beam1-5, beam1-6, and beam1-7 to the network device.

Optionally, the terminal receives second indication information sent bythe network device. The second indication information is used toindicate a maximum quantity Z of beams in a first beam group. For ameaning and a determining manner of the first beam group, refer torelated descriptions in the foregoing embodiments. Details are notdescribed herein again.

Optionally, the second indication information may be sent together withanother reporting condition parameter and/or the first indicationinformation, or sent separately. The terminal may combine the secondindication information with other reporting condition parameter(s)and/or the first indication information for use.

A maximum quantity of beam identifiers carried by the terminal in themeasurement report may be limited by using the second indicationinformation. Z may be different from or the same as a quantity of beamsthat are used during measurement.

S602: The terminal sends a first measurement report, where the firstmeasurement report includes identification information and signalquality of beams in a first beam group, or the first measurement reportincludes a quantity of beams in a first beam group, or the firstmeasurement report includes identification information of beams in afirst beam group.

In this embodiment of this application, the terminal reports themeasurement information of beam(s) based on a network configuration, sothat the network device may make a handover decision more accurately.

It may be understood that the communication method described inEmbodiment 4 is applicable to any scenario in which a handover decisionis required. Optionally, the method in Embodiment 4 may be independentof other embodiments or may be combined with other embodiments.

It may be understood that the terminal may perform some or all of thesteps in the embodiment. These steps or operations are merely examples.In this embodiment of this application, other operations or variants ofoperations may be further performed.

Embodiment 5

This embodiment of this application provides a communication method. Anetwork device receives a first measurement report sent by a terminal,where the first measurement report is sent by the terminal when theterminal determines that information about a first beam group, whichmeets a condition for reporting a measurement report, in a first cell isdifferent from information about beams in the first cell that isincluded in a previous measurement report. The first measurement reportincludes identification information of beams in the first beam group andsignal quality of the beams in the first beam group, or the firstmeasurement report includes a quantity of beams in the first beam group,or the first measurement report includes identification information ofbeams in the first beam group.

In another possible design, the network device receives initial signalquality of the first cell and a first quantity of beams that are used todetermine signal quality of the first cell. The network devicedetermines the signal quality of the first cell with reference to theinitial signal quality of the first cell and an offset, where the offsetis determined based on the first quantity.

In another possible design, the network device sends first indicationinformation to the terminal, where the first indication information isused to indicate that the first measurement report to be reported by theterminal includes the identification information and the signal qualityof the beams in the first beam group, or the first indicationinformation is used to indicate that the first measurement reportincludes the quantity of the beams in the first beam group, or the firstindication information is used to indicate that the first measurementreport includes the identification information of the beams in the firstbeam group.

In another possible design, the network device sends second indicationinformation to the terminal, where the second indication information isused to indicate a maximum quantity of pieces of identificationinformation that is included in the first measurement report to bereported by the terminal and/or a maximum quantity of signal qualityvalues of beams that is included in the first measurement report.

In this embodiment of this application, for the method for determiningthe signal quality of the first cell by the network device based on theinitial signal quality of the first cell and the offset, and meanings ofthe first measurement report, the first indication information, and thesecond indication information, refer to the foregoing Embodiment 1,Embodiment 3, and Embodiment 4. Details are not described herein again.

Embodiment 6

This embodiment of this application provides a terminal. The terminalmay implement functions of the terminal in the methods described in theforegoing embodiments of this application.

Optionally, as shown in FIG. 7, the terminal 700 may include a firstcommunications unit 701 and a first processing unit 702.

The first processing unit 702 is configured to determine thatinformation about a first beam group, which meets a condition forreporting a measurement report, in a first cell is different frominformation about beams in the first cell that is included in a previousmeasurement report.

The first communications unit 701 is configured to send a firstmeasurement report, where the first measurement report includesidentification information and signal quality of beams in the first beamgroup, or the first measurement report includes a quantity of beams inthe first beam group, or the first measurement report includesidentification information of beams in the first beam group.

Optionally, the first communications unit 701 is further configured toreceive first indication information and/or second indicationinformation sent by a network device.

It should be noted that, for functions and implementations of functionalunits of the terminal 700 described in this embodiment of thisapplication, and meanings and obtaining manners of related parameters,refer to related descriptions of the corresponding terminal in theforegoing Embodiment 1. Details are not described herein again.

Optionally, this embodiment of this application provides anotherterminal. As shown in FIG. 8, the terminal 800 may include: a secondcommunications unit 801 and a second processing unit 802.

The second communications unit 801 is configured to obtain signalquality of each beam in a first cell.

The second processing unit 802 is configured to determine signal qualityof the first cell based on signal quality of a maximum of M beams havinghighest signal quality among the signal quality that is of the beams inthe first cell and that is obtained by the second communications unit801.

Alternatively, the second processing unit 802 is further configured to:when the signal quality of each beam in the first cell is below a firstpreset threshold, determine the signal quality of the first cell basedon signal quality of X beams whose signal quality has a smallestdifference from the first preset threshold among the signal quality thatis of the beams in the first cell and that is obtained by the secondcommunications unit 801.

Alternatively, the second processing unit 802 is further configured to:when the signal quality of each beam in the first cell is below a firstpreset threshold, determine the signal quality of the first cell basedon signal quality of Y beams that have a difference less than a secondpreset threshold from signal quality of a target beam.

It should be noted that, for functions and implementations of functionalunits of the terminal 800 described in this embodiment of thisapplication, and meanings and obtaining manners of related parameters,refer to related descriptions of the corresponding terminal in theforegoing Embodiment 2. Details are not described herein again.

Optionally, this embodiment of this application provides anotherterminal. As shown in FIG. 9, the terminal 900 may include: a thirdcommunications unit 901 and a third processing unit 902.

The third communications unit 901 is configured to obtain a firstquantity of beams that are used to determine signal quality of a firstcell.

The third processing unit 902 is configured to determine the signalquality of the first cell based on an offset, where the offset isdetermined based on the first quantity obtained by the thirdcommunications unit 901.

The third communications unit 901 is further configured to report thesignal quality of the first cell determined by the third processing unit902 to a network device.

It should be noted that, for functions and implementations of functionalunits of the terminal 900 described in this embodiment of thisapplication, and meanings and obtaining manners of related parameters,refer to related descriptions of the corresponding terminal in theforegoing Embodiment 3. Details are not described herein again.

Optionally, this embodiment of this application provides anotherterminal. As shown in FIG. 10, the terminal 1000 may include: areceiving unit 1001 and a sending unit 1002.

The receiving unit 1001 is configured to receive first indicationinformation sent by a network device. The sending unit 1002 isconfigured to send a first measurement report based on the firstindication information. For details about how the first measurementreport is sent based on the first indication information, refer toEmbodiment 4. Details are not described herein again.

It should be noted that, for functions of functional units of theterminal 1000 described in this embodiment of this application, refer torelated descriptions of the corresponding terminal in the foregoingEmbodiment 4. Details are not described herein again.

It may be understood that, as described in the method embodiments,Embodiment 1 to Embodiment 4 may be independently implemented orcombined, and functions that may be included in a communications unit ora processing unit of the terminal in this embodiment of this applicationmay also be combined. For example, the first communications unit 701 mayalso implement functions of one or more units of the secondcommunications unit, the third communications unit, the receiving unit,and the sending unit, and the first processing unit may also implementfunctions of the second processing unit and the third processing unit;or the second communications unit may also implement functions of one ormore units of the first communications unit, the third communicationsunit, the receiving unit, and the sending unit; and so on. Examples arenot given one by one in this embodiment of this application.

Embodiment 7

This embodiment of this application provides a network device. Thenetwork device 1100 may implement functions of the network device in themethods described in the foregoing embodiments of this application.

As shown in FIG. 11, the network device may include: a communicationsunit 1101 and a processing unit 1102.

The communications unit 1101 is configured to receive a firstmeasurement report sent by a terminal, where the first measurementreport is sent by the terminal when the terminal determines thatinformation about a first beam group, which meets a condition forreporting a measurement report, in a first cell is different frominformation about beams in the first cell that is included in a previousmeasurement report. The first measurement report includes identificationinformation of beams in the first beam group and signal quality of thebeams in the first beam group, or the first measurement report includesa quantity of beams in the first beam group, or the first measurementreport includes identification information of beams in the first beamgroup.

Optionally, the communications unit 1101 is further configured toreceive initial signal quality of the first cell and a first quantity ofbeams that are used to determine signal quality of the first cell.

The processing unit 1102 is configured to determine the signal qualityof the first cell with reference to the initial signal quality of thefirst cell and an offset, where the offset is determined based on thefirst quantity.

Optionally, the communications unit 1101 is further configured to sendfirst indication information to the terminal, where the first indicationinformation is used to indicate that the first measurement report to bereported by the terminal includes the identification information and thesignal quality of the beams in the first beam group, or the firstindication information is used to indicate that the first measurementreport includes the quantity of the beams in the first beam group, orthe first indication information is used to indicate that the firstmeasurement report includes the identification information of the beamsin the first beam group.

Optionally, the communications unit 1101 is further configured to sendsecond indication information to the terminal, where the secondindication information is used to indicate a maximum quantity of piecesof identification information that is included in the first measurementreport to be reported by the terminal and/or a maximum quantity ofsignal quality values of beams that is included in the first measurementreport.

It should be noted that, for functions of functional units of thenetwork device 1100 described in this embodiment of this application,refer to related descriptions of the corresponding network device in theforegoing Embodiment 5. Details are not described herein again.

FIG. 12 shows a terminal 1200 according to another embodiment of thisapplication. The terminal 1200 includes a processor 1201, a memory 1202,and a communications module 1203.

The memory 1202 includes but is not limited to a random access memory(RAM for short), a read-only memory (ROM for short), or an erasableprogrammable read only memory (EPROM for short). The memory 1202 isconfigured to store related program code and related data.

The processor 1201 may be one or more central processing units (CPU forshort). When the processor 1201 is one CPU, the CPU may be a single-coreCPU, or may be a multi-core CPU.

In a first implementation, the processor 1201 in the terminal 1200 readsthe program code stored in the memory 1202 to perform the followingoperations:

The processor 1201 is configured to determine that information about afirst beam group, which meets a condition for reporting a measurementreport, in a first cell is different from information about beams in thefirst cell that is included in a previous measurement report.

The communications module 1203 is configured to send a first measurementreport, where the first measurement report includes identificationinformation and signal quality of beams in the first beam group, or thefirst measurement report includes a quantity of beams in the first beamgroup, or the first measurement report includes identificationinformation of beams in the first beam group.

The processor 1201 is specifically configured to: determine that theidentification information of the beams in the first beam group, whichmeets the condition for reporting a measurement report, in the firstcell is different from identification information of the beams in thefirst cell that is included in the previous measurement report; and/ordetermine that the quantity of the beams in the first beam group, whichmeets the condition for reporting a measurement report, in the firstcell is different from a quantity of beams in the first cell that isincluded in the previous measurement report.

The identification information of the beam includes at least one of: abeam identifier, antenna port identifier of the beam, a reference signalof the beam, and a beam index.

The first measurement report may further include the signal quality ofthe first cell.

The processor 1201 is further configured to determine the signal qualityof the first cell based on an offset, where the offset corresponds to aquantity of beams that are used to determine the signal quality of thefirst cell.

The condition for reporting a measurement report includes a reportingparameter related to the quantity of the beams that are used todetermine the signal quality of the first cell, where the reportingparameter includes at least one of a signal quality threshold,hysteresis, time to trigger, and an offset for reporting.

The communications module 1203 is further configured to receive firstindication information sent by a network device, where the firstindication information is used to indicate that the first measurementreport includes the identification information and the signal quality ofthe beams in the first beam group, or the first indication informationis used to indicate that the first measurement report includes thequantity of the beams in the first beam group, or the first indicationinformation is used to indicate that the first measurement reportincludes the identification information of the beams in the first beamgroup.

The communications module 1203 is further configured to receive secondindication information sent by the network device, where the secondindication information is used to indicate a maximum quantity of piecesof identification information that is included in the first measurementreport and/or a maximum quantity of signal quality values of the beamsthat is included in the first measurement report.

In another implementation, the processor 1201 in the terminal 1200 readsthe program code stored in the memory 1202 to perform the followingoperations:

The communications module 1203 is configured to obtain signal quality ofeach beam in a first cell.

The processor 1201 is configured to: when the signal quality of eachbeam in the first cell is below a first preset threshold, determinesignal quality of the first cell based on signal quality of X beamswhose signal quality has a smallest difference from the first presetthreshold, where the X beams belong to the first cell, and X is aninteger greater than 0, or determine signal quality of the first cellbased on signal quality of Y beams that have a difference less than asecond preset threshold from signal quality of a target beam, where thetarget beam belongs to the first cell and is a beam whose signal qualityhas a smallest difference from the first preset threshold, the Y beamsbelong to the first cell, and Y is an integer greater than 0.

It should be noted that, for functions of function modules in theterminal 1200, refer to related descriptions of the correspondingterminal in the embodiments shown in FIG. 2 to FIG. 6. Details are notdescribed herein again. Optionally, the processor 1201 may be configuredto implement functions of one or more units of the first processingunit, the second processing unit, and the third processing unit, and thecommunications module 1203 may be configured to implement functions ofone or more units of the first communications unit, the secondcommunications unit, the third communications unit, the receiving unit,and the sending unit. In the several embodiments provided in thisapplication, it should be understood that the disclosed apparatus andmethod may be implemented in other manners. For example, the describedapparatus embodiment is merely an example. For example, the unitdivision is merely logical function division and may be other divisionin actual implementation. For example, a plurality of units orcomponents may be combined or integrated into another system, or somefeatures may be ignored or not performed. In addition, the displayed ordiscussed mutual couplings, or direct couplings, or communicationconnections may be implemented by using some interfaces. The indirectcouplings or communication connections between the apparatuses or unitsmay be implemented in electronic, mechanical, or other forms.

The units described as separate parts may or may not be physicallyseparate, and parts displayed as units may or may not be physical units,may be located in one position, or may be distributed on a plurality ofnetwork units. Some or all of the units may be selected based on actualrequirements to achieve the objectives of the solutions of theembodiments.

In addition, functional units in the embodiments of this application maybe integrated into one processing unit, or each of the units may existalone physically, or two or more units may be integrated into one unit.The foregoing integrated unit may be implemented in a form of hardware,or may be implemented in a form of hardware in addition to a softwarefunctional unit.

Some of the foregoing software functions may be stored in a storageunit. The storage unit includes instructions used to enable a computerdevice (which may be a personal computer, a server, or a network device)or a processor to perform some of the steps of the methods described inthe embodiments of this application. The storage unit includes: one ormore memories, such as a read-only memory (ROM), a random access memory(RAM), and an electrically erasable programmable read-only memory(EEPROM). The storage unit may exist independently, or may be integratedwith the processor.

It may be understood by persons skilled in the art that, for the purposeof convenient and brief description, division of the foregoing functionmodules is used as an example for illustration. In actual application,the foregoing functions can be allocated to different function modulesand implemented based on a requirement, that is, an inner structure ofan apparatus is divided into different function modules to implement allor some of the functions described above. For a detailed working processof the foregoing apparatus, refer to a corresponding process in theforegoing method embodiments, and details are not described hereinagain.

Persons of ordinary skill in the art may understand that serial numberssuch as “first” and “second” in this application are used only forconvenience of description and distinguishing and are not intended tolimit the scope of the embodiments of this application.

Persons of ordinary skill in the art may understand that serial numbersof the foregoing processes do not mean execution sequences in theembodiments of this application. The execution sequences of theprocesses should be determined based on functions and internal logic ofthe processes, and should not be construed as any limitation on theimplementation processes of the embodiments of this application.

All or some of the foregoing embodiments may be implemented by usingsoftware, hardware, firmware, or any combination thereof. When softwareis used to implement the embodiments, the embodiments may be implementedcompletely or partially in a form of a computer program product. Thecomputer program product includes one or more computer instructions.When the computer program instructions are loaded and executed on thecomputer, the procedure or functions described in the embodiments of thepresent invention are all or partially generated. The computer may be ageneral-purpose computer, a dedicated computer, a computer network, oranother programmable apparatus. The computer instructions may be storedin a computer readable storage medium or may be transmitted from acomputer readable storage medium to another computer readable storagemedium. For example, the computer instructions may be transmitted from awebsite, computer, server, or data center to another website, computer,server, or data center in a wired (for example, a coaxial cable, anoptical fiber, or a digital subscriber line (DSL)) or wireless (forexample, infrared, radio, or microwave) manner. The computer readablestorage medium may be any usable medium accessible to a computer, or adata storage device, such as a server or a data center, integrating oneor more usable media. The usable medium may be a magnetic medium (forexample, a floppy disk, a hard disk, or a magnetic tape), an opticalmedium (for example, a DVD), a semiconductor medium (for example, asolid state disk (SSD)), or the like.

FIG. 13 shows a network device 1300 according to another embodiment ofthis application. The network device 1300 includes a processor 1301, amemory 1302, and a communications module 1303.

The memory 1302 includes but is not limited to a random access memoryRAM, a read-only memory ROM, or an erasable programmable read onlymemory EPROM. The memory 1302 is configured to store related programcode and related data.

The processor 1301 may be one or more central processing units CPU. Whenthe processor 1301 is one CPU, the CPU may be a single-core CPU, or maybe a multi-core CPU.

In an implementation, the processor 1201 in the network device 1300reads the program code stored in the memory 1202 to perform followingoperations:

The communications module 1303 is configured to receive firstmeasurement report sent by a terminal, where the first measurementreport is sent by the terminal when the terminal determines thatinformation about a first beam group, which meets a condition forreporting a measurement report, in a first cell is different frominformation about beams in the first cell that is included in a previousmeasurement report. The first measurement report includes identificationinformation of beams in the first beam group and signal quality of thebeams in the first beam group, or the first measurement report includesa quantity of beams in the first beam group, or the first measurementreport includes identification information of beams in the first beamgroup.

In another possible design, the communications module 1303 is configuredto receive initial signal quality of the first cell and a first quantityof beams that are used to determine signal quality of the first cell.

The processor 1301 is configured to determine the signal quality of thefirst cell with reference to the initial signal quality of the firstcell and an offset, where the offset is determined based on the firstquantity.

The communications module 1303 is configured to send first indicationinformation to the terminal, where the first indication information isused to indicate that the first measurement report to be reported by theterminal includes the identification information and the signal qualityof the beams in the first beam group, or the first indicationinformation is used to indicate that the first measurement reportincludes the quantity of the beams in the first beam group, or the firstindication information is used to indicate that the first measurementreport includes the identification information of the beams in the firstbeam group.

The communications module 1303 is configured to send second indicationinformation to the terminal, where the second indication information isused to indicate a maximum quantity of pieces of identificationinformation that is included in the first measurement report to bereported by the terminal and/or a maximum quantity of signal qualityvalues of beams that is included in the first measurement report.

For this embodiment of this application, refer to related descriptionsin Embodiment 5. Details are not described herein again.

Finally, it should be noted that the foregoing embodiments are merelyintended for describing the technical solutions of this applicationother than limiting this application. Although this application isdescribed in detail with reference to the foregoing embodiments, personsof ordinary skill in the art should understand that they may still makemodifications to the technical solutions described in the foregoingembodiments or make equivalent replacements to some or all technicalfeatures thereof, without departing from the scope of the technicalsolutions of the embodiments of this application.

What is claimed is:
 1. A communication method comprising: determining,by a terminal, first signal quality of a first cell based on a firstquantity of beams in the first cell; determining, by the terminal, anoffset based on the first quantity; and determining, by the terminal,second signal quality of the first cell based on the offset and thefirst signal quality.
 2. The method according to claim 1, whereindetermining the offset based on the first quantity comprises:determining a coefficient of basic measurement offset delta based on thefirst quantity; and multiplying the coefficient by the basic measurementoffset delta to obtain the offset corresponding to the first quantity.3. The method according to claim 2, wherein determining the secondsignal quality of the first cell comprises: adjusting, by the terminalusing the offset corresponding to the first quantity, signal qualitydirectly obtained based on a beam of the first quantity of beams, toobtain the second signal quality of the first cell.
 4. The methodaccording to claim 1, wherein determining the second signal quality ofthe first cell comprises: adjusting, by the terminal using the offset,signal quality directly obtained based on a beam of the first quantityof beams, to obtain the second signal quality of the first cell.
 5. Themethod according to claim 4, wherein the beam has highest signal qualityamong the first quantity of beams in the first cell with signal qualityof each beam of the first quantity of beams below a first presetthreshold.
 6. The method according to claim 5, wherein the beam havingthe highest signal quality among the first quantity of beams in thefirst cell is X beams whose signal quality has a smallest differencefrom the first preset threshold, the X beams belong to the first cell,and X is an integer greater than
 0. 7. The method according to claim 6,wherein X is equal to
 1. 8. The method according to claim 4, whereinwhen there is at least one beam, among the first quantity of beams,whose signal quality is higher than a preset threshold, the signalquality directly obtained based on the beam is obtained based on anaverage value of the signal quality of the at least one beam.
 9. Themethod according to claim 1, further comprising: sending the secondsignal quality of the first cell.
 10. An apparatus, comprising: anon-transitory memory storage comprising instructions; and one or moreprocessors in communication with the memory storage, wherein the one ormore processors execute the instructions to cause the apparatus to:determine first signal quality of a first cell based on a first quantityof beams in the first cell; determine an offset based on the firstquantity; and determine second signal quality of the first cell based onthe offset and the first signal quality.
 11. The apparatus according toclaim 10, wherein the one or more processors further execute theinstructions to cause the apparatus to: determine a coefficient of basicmeasurement offset delta based on the first quantity; and multiply thecoefficient by the basic measurement offset delta to obtain the offsetcorresponding to the first quantity.
 12. The apparatus according toclaim 11, wherein the one or more processors further execute theinstructions to cause the apparatus to: adjust, by using the offsetcorresponding to the first quantity, signal quality directly obtainedbased on a beam of the first quantity of beams, to obtain the secondsignal quality of the first cell.
 13. The apparatus according to claim10, wherein the one or more processors further execute the instructionsto cause the apparatus to: adjust, by using the offset, signal qualitydirectly obtained based on a beam of the first quantity of beams, toobtain the second signal quality of the first cell.
 14. The apparatusaccording to claim 13, wherein the beam has highest signal quality amongthe first quantity of beams in the first cell with signal quality ofeach beam of the first quantity of beams below a first preset threshold.15. The apparatus according to claim 14, wherein the beam having thehighest signal quality among the first quantity of beams in the firstcell is X beams whose signal quality has a smallest difference from thefirst preset threshold, the X beams belong to the first cell, and X isan integer greater than
 0. 16. The apparatus according to claim 15,wherein X is equal to
 1. 17. The apparatus according to claim 13,wherein when there is at least one beam, among the first quantity ofbeams, whose signal quality is higher than a preset threshold, thesignal quality directly obtained based on the beam is obtained based onan average value of the signal quality of the at least one beam.
 18. Theapparatus according to claim 10, wherein the one or more processorsfurther execute the instructions to cause the apparatus to: send thesecond signal quality of the first cell.
 19. A non-transitorycomputer-readable storage medium storing a program to be executed by aprocessor, the program including instructions for: determining firstsignal quality of a first cell based on a first quantity of beams in thefirst cell; determining an offset based on the first quantity; anddetermining second signal quality of the first cell based on the offsetand the first signal quality.
 20. The storage medium according to claim19, wherein the program further includes instructions for: determining acoefficient of basic measurement offset delta based on the firstquantity; and multiplying the coefficient by the basic measurementoffset delta to obtain the offset corresponding to the first quantity.